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INCOME TAX EXPENSE/(CREDIT) - Deferred tax (assets)/liabilities recognized in the consolidated statements of financial position and the movements during the years (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]      
Balance ¥ 0 ¥ (209) ¥ (4,765)
Charges/(credits) for the year 0 209 4,556
Balance 0 0 (209)
Dividend Withholding Tax [Member]      
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]      
Balance 0 0 0
Charges/(credits) for the year 0 0 0
Balance 0 0 0
Inventory Provision [Member]      
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]      
Balance 0 0 (4,765)
Charges/(credits) for the year 0 0 4,765
Balance 0 0 0
Impairment Loss [Member]      
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]      
Balance 0 0 0
Charges/(credits) for the year 0 0 0
Balance 0 0 0
Bad Debt Allowance [Member]      
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]      
Balance 0 0 0
Charges/(credits) for the year 0 0 0
Balance 0 0 0
Net Operating Allowance [Member]      
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]      
Balance 0 0 0
Charges/(credits) for the year 0 0 0
Balance 0 0 0
Depreciation And Amortization [Member]      
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]      
Balance 0 (209) 0
Charges/(credits) for the year 0 209 (209)
Balance ¥ 0 ¥ 0 ¥ (209)